@inproceedings{ijcai1981p49,
  title     = {The Role of Roles: Some Aspects of Real World Knowledge Representation},
  author    = {Trost, Harald and Steinacker, Ingeborg},
  booktitle = {Proceedings of the Seventh International Joint Conference on
               Artificial Intelligence, {IJCAI-81}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Roger C. Schank},
  pages     = {237--238},
  year      = {1981},
  month     = {8},
  note      = {Nowledge Representation},
  url       = {https://ijcai.org/proceedings/1981/49},
}